Only when he failed the exam ________ that he didn’t work hard. (原创)

Don’t forget to return the book in two weeks. —— _____ Don’t worry about it.

Lori, did you told Mark the time of the meeting? —- I _______ him, but he didn’t answer me.

The little boy was the only one who _____ the earthquake in his village, and the government sent him to a city school after that. [ ]

You will fail ______you work hard.